1963] 
Carpenter — Carboniferous Insects 
123 
The left fore wing (fig. b, plate 14) shows less of the wing area 
than the right, lacking the distal third and most of the entire hind 
margin ; however, the basal part of the wing is clearly preserved and 
there seems little distortion in the preserved part of the wing. I could 
find no indication of the part of the hind margin suggested in Demou- 
lin’s paper nor of the submarginai costa and precostal space which he 
indicates in the left fore wing. It is of interest to note, incidentally, 
that the anterior margin of the wing near the base shows clear indica- 
tions of serrations, comparable to those which have been seen in some 
Palaeodictyoptera. The origins of Rs and MA can easily be seen in 
this wing: Rs arises directly from R, without contact with MA, which 
can be seen to arise from the basal part of R, just a short distance basal 
of the origin of Rs. It is possible, of course, that the stem of M is 
actually parallel and in contact with R but it is not discernible in the 
fossil. 
The left hind wing (fig. d, plate 14) is very nearly completely pre- 
served, lacking only a short piece of the anterior margin towards the 
middle line of the wing; it shows no distortion. I could find no sign 
in the fossil of the precostal space and and submarginal costa shown in 
Demoulin’s figure. Rs can be seen clearly arising from R, as in the 
two fore wings but the basal part of MA is very different in position 
from that in the other wings mentioned; basally it is more removed 
from Rs than in the fore wings and it appears to meet MP very close 
to the base of M itself. There is no visible connection between MA 
and R directly. The common stem M appears to be very close to R 
and may be in contact with it. The origins of CuA and CuP are not 
preserved ; however, CuA shortly diverges away slightly from MP 
producing an unusually wide space and at about the same level CuP 
diverges towards CuA, the two latter veins being almost in contact 
at that point. CuA and CuP subsequently diverge as they approach 
the wing margin. 
The right hand wing is the most poorly preserved of all, showing 
distortion and folding. The longitudinal veins are irregularly dis- 
tributed over the wing area. The origins of Rs and MA are not 
preserved but the proximal parts of these veins seem to be remote 
from each other as in the other hind wing. 
As can be seen from the foregoing remarks, I am in agreement with 
Brongniart and Lameere that the fore and hind wings of Triplosoba 
were very similar in form and in venation. I believe that Brongniart’s 
drawing, figure 9 of plate 18, is reasonably accurate, although more 
cross veins are shown in his figure than are now discernible in the 
specimen. I think it is probable that the fore and hind wings diffei 
